Now showing items 11-20 of 52
Long range exciton percolation and superexchange: Energy denominator study on 3B1u naphthalene
(Elsevier, 1977-02-01)
The long-range exciton percolation model is found to describe the lowest triplet exciton superexchange ("tunneling") migration at low temperature (2 K), in our model alloy system: Binary isotopic mixed naphthalene crystals ...
Molecular dynamics study of orientational order and rotational melting in clusters of TeF 6
(Springer-Verlag, 1994-03)
Molecular dynamics simulations of the behavior of molecules in crystalline clusters of TeF 6 were carried out on systems of 100, 150, 250, and 350 molecules. Several diagnostic functions were applied to investigate whether ...
Exciton reactions in ultrathin molecular wires, filaments and pores: A case study of kinetics and self-ordering in low dimensions
(Elsevier, 1988-12-01)
When are molecular wires thin enough to show one-dimensional exciton kinetics? Cylindrical naphthalene wires ( 5-5000 nm radius) show a definite one- to three-dimensional transition (about 25 nm for triplet excitons at 4 ...
Scaling properties of diffusion-limited reactions on fractal and euclidean geometries
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1991-12)
We review our scaling results for the diffusion-limited reactions A + A → 0 and A+B→0 on Euclidean and fractal geometries. These scaling results embody the anomalies that are observed in these reactions in low dimensions; ...
Spectroscopic and optically detected magnetic resonance studies of PO2-in potassium chloride. I. Electronic and vibrational states
(Elsevier, 1979-06-01)
The phosphorescence and phosphorescence excitation spectra of phosphorus activated single crystals of potassium chloride have been examined at 4.2 K. The "color center" responsible for the blue emission in these samples ...
Exciton transport in disordered crystals: velocity correlation functions
(Elsevier, 1984-09-15)
The two-particle coherent-potential approximation is used to calculate Frenkel-exciton group-velocity correlation functions for substitutionally disordered crystals. Most of the results can be described by a relaxation-time ...
Molecular dynamics studies of homogeneous nucleation in solid-state transitions
(Springer-Verlag, 1993-03)
Simulations of clusters containing 100 to 250 molecules of TeF 6 successfully reproduce the crystalline packing arrangements observed in electron diffraction investigations of large molecular clusters (∼ 10 4 molecules) ...
A spectroscopic and optically detected magnetic resonance study of PO-2 in potassium chloride. III. Photo-orientation
(Elsevier, 1980-01-01)
The small molecular anion PO-2 has been incorporated at chloride ion vacancies in the potassium chloride lattice, where the relatively high symmetry of the crystal field permits a variety of crystallographically equivalent ...
Quantitative tests of mixed crystal excition theory. I. Naphthalene monomer1B2u and 3B1u spectra
(Elsevier, 1974-11)
A quantitative, computer processed spectroscopic study, using photon counting, on the first excited triplet and singlet states of dilute isotopic mixed crystals of naphthalene at 2 K is presented for C10H8; 1-DC10H7; ...
Exciton band of a one-molecule-per-unit-cell crystal: hexamethylbenzene first singlet
(Elsevier, 1977-05-15)
The exciton band structure has been determined experimentally, from quantitative band--band fluorescence and absorption measurements, for the first singlet excited state of the low temperature phase of the hexamethylbenzene ...